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s5pv210 u-boot的那些事儿之---mem_setup.S的分析

jayyuz 分享于 2015-04-08

推荐:Tiny210(S5PV210) U-BOOT(六)----DDR内存配置

上次讲完了Nand Flash的低级初始化,然后Nand Flash的操作主要是在board_init_f_nand(),中,涉及到将代码从Nand Flash中copy到DDR中,这个放到后面实际移植的过

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接上一篇,这一篇写得是内存初始化。本人对ddr初始化,不是特别懂。只是勉强翻译注释。如有错误,希望高手能不吝赐教。废话不多说,贴上这该死的代码。

推荐:S5PV210之UBOOT-2011.06启动过程解析-基于u-boot for tiny210 ver3.1 (by liukun321咕唧咕唧)

//主题:S5PV210之UBOOT-2011.06启动过程解析 //作者:kevinjz2010@gmail.com //版权:kevinjz原创 //平台:S5PV210 ARMV7 TINY210 //发布日期:2012-05-24 //最

/* * armboot - Memory Initialize Code for S5PV210/ARM-Cortex CPU-core * * Copyright (c) 2009 Samsung Electronics * * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * * Base codes by scsuh (sc.suh) * Modified By JhoonKim (jhoon_kim@nate.com), aESOP Embedded Forum(http://www.aesop.or.kr) * 10.08.15 - To Supported for SEC K4T1G164QX DDR2 Memory for aESOP S5PV210 */

#include <config.h>
#include <s5pc110.h>

    .globl mem_ctrl_asm_init    //全局变量
mem_ctrl_asm_init:

#ifndef CONFIG_EVT1 //由于定义过,所以再次不用分析

    ldr     r0, =ASYNC_MSYS_DMC0_BASE   //0xF1E00000

    ldr     r1, =0x0
    str     r1, [r0, #0x0]

    /* This register is removed at EVT1 of C110. */
    ldr     r1, =0x0
    str     r1, [r0, #0xC]

#endif

#ifdef CONFIG_MCP_SINGLE

    /* DMC0 Drive Strength (Setting 2X) 设置内存访问信号的强度*/
    /*DRAM Driver Strength 数值越大,则内存访问信号的强度也越大。内存对工作频率是比较敏感的,当工作频率高于 内存的标称频率时, 将该选项的数值调高, 可以提高电脑在超频状态下的稳定性*/

    ldr r0, =ELFIN_GPIO_BASE    //0xE0200000

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP1_0DRV_SR_OFFSET] //0xE020_03CC

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP1_1DRV_SR_OFFSET] //0xE020_03EC

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP1_2DRV_SR_OFFSET] //0xE020_040C

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP1_3DRV_SR_OFFSET] //0xE020_042C

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP1_4DRV_SR_OFFSET] //0xE020_044C

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP1_5DRV_SR_OFFSET] //0xE020_046C

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP1_6DRV_SR_OFFSET] //0xE020_048C

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP1_7DRV_SR_OFFSET] //0xE020_04AC

    ldr r1, =0x00002AAA
    str r1, [r0, #MP1_8DRV_SR_OFFSET] //0xE020_04CC


    /* DMC1 Drive Strength (Setting 2X) */

    ldr r0, =ELFIN_GPIO_BASE    //0xE0200000 形同上面,就不细细的写了

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP2_0DRV_SR_OFFSET]

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP2_1DRV_SR_OFFSET]

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP2_2DRV_SR_OFFSET]

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP2_3DRV_SR_OFFSET]

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP2_4DRV_SR_OFFSET]

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP2_5DRV_SR_OFFSET]

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP2_6DRV_SR_OFFSET]

    ldr r1, =0x0000AAAA
    str r1, [r0, #MP2_7DRV_SR_OFFSET]

    ldr r1, =0x00002AAA
    str r1, [r0, #MP2_8DRV_SR_OFFSET]

    /* DMC0 initialization at single Type 初始化PHY DLL */
    /* 凡是使用 DDR 类型的 DRAM,都需要使用 DLL(Delay Locked Loop 延时锁定回路提供一个数据滤波信号)技术,当数据有效时, 存储控制器可使用这个数据滤波信号来精确定位数据。*/
    ldr r0, =APB_DMC_0_BASE //0xF000_0000

    ldr r1, =0x00101000             @PhyControl0 DLL parameter setting, manual 0x00101000
    /* bit[15:8] DLL Lock Start Point Initial DLL lock start point. This is the number of delay cells and is the start point where "DLL" start tracing to lock. CalculatesInitial delay time by multiplying the unit delay of delay cell and this value. This value should be 0x10 bit [23:16] DLL Delay Increment Increase the amount of start point 这个值应该设置为0x10 */
    str r1, [r0, #DMC_PHYCONTROL0] //PHY Control0 Register(0xF000_0018)

    ldr r1, =0x00000086             @PhyControl1 DLL parameter setting, LPDDR/LPDDR2 Case
    str r1, [r0, #DMC_PHYCONTROL1] //0xF000_001C PHY Control1 Register

    ldr r1, =0x00101002             @PhyControl0 DLL on
    str r1, [r0, #DMC_PHYCONTROL0] //0xF000_0018

    ldr r1, =0x00101003             @PhyControl0 DLL start
    str r1, [r0, #DMC_PHYCONTROL0] //0xF000_0018

find_lock_val:
    ldr r1, [r0, #DMC_PHYSTATUS] @Load Phystatus register value 0xF000_0040
    and r2, r1, #0x7
    cmp r2, #0x7 @Loop until DLL is locked
    bne find_lock_val

    and r1, #0x3fc0
    mov r2, r1, LSL #18
    orr r2, r2, #0x100000
    orr r2 ,r2, #0x1000

    orr r1, r2, #0x3 @Force Value locking
    str r1, [r0, #DMC_PHYCONTROL0] //0xF000_0018

#if 0 /* Memory margin test 10.01.05 */
    orr r1, r2, #0x1 @DLL off
    str r1, [r0, #DMC_PHYCONTROL0]
#endif
    /* setting DDR2 */
    ldr r1, =0x0FFF2010             @ConControl auto refresh off
    str r1, [r0, #DMC_CONCONTROL]

    ldr r1, =DMC0_MEMCONTROL            @MemControl BL=4, 1 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
    str r1, [r0, #DMC_MEMCONTROL]

    ldr r1, =DMC0_MEMCONFIG_0           @MemConfig0 256MB config, 8 banks,Mapping Method[12:15]0:linear, 1:linterleaved, 2:Mixed
    str r1, [r0, #DMC_MEMCONFIG0]

    ldr r1, =DMC0_MEMCONFIG_1           @MemConfig1
    str r1, [r0, #DMC_MEMCONFIG1]

    ldr r1, =0xFF000000             @PrechConfig
    str r1, [r0, #DMC_PRECHCONFIG]

    ldr r1, =DMC0_TIMINGA_REF           @TimingAref 7.8us*133MHz=1038(0x40E), 100MHz=780(0x30C), 20MHz=156(0x9C), 10MHz=78(0x4E)
    str r1, [r0, #DMC_TIMINGAREF]

    ldr r1, =DMC0_TIMING_ROW            @TimingRow  for @200MHz
    str r1, [r0, #DMC_TIMINGROW]

    ldr r1, =DMC0_TIMING_DATA           @TimingData CL=4
    str r1, [r0, #DMC_TIMINGDATA]

    ldr r1, =DMC0_TIMING_PWR            @TimingPower
    str r1, [r0, #DMC_TIMINGPOWER]

    ldr r1, =0x07000000             @DirectCmd  chip0 Deselect
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01000000             @DirectCmd  chip0 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00020000             @DirectCmd  chip0 EMRS2
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00030000             @DirectCmd  chip0 EMRS3
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00010400             @DirectCmd  chip0 EMRS1 (MEM DLL on, DQS# disable)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00000542             @DirectCmd  chip0 MRS (MEM DLL reset) CL=4, BL=4
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01000000             @DirectCmd  chip0 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05000000             @DirectCmd  chip0 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05000000             @DirectCmd  chip0 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00000442             @DirectCmd  chip0 MRS (MEM DLL unreset)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00010780             @DirectCmd  chip0 EMRS1 (OCD default)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00010400             @DirectCmd  chip0 EMRS1 (OCD exit)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x07100000             @DirectCmd  chip1 Deselect
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01100000             @DirectCmd  chip1 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00120000             @DirectCmd  chip1 EMRS2
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00130000             @DirectCmd  chip1 EMRS3
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00110400             @DirectCmd  chip1 EMRS1 (MEM DLL on, DQS# disable)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00100542             @DirectCmd  chip1 MRS (MEM DLL reset) CL=4, BL=4
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01100000             @DirectCmd  chip1 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @DirectCmd  chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @DirectCmd  chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00100442             @DirectCmd  chip1 MRS (MEM DLL unreset)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00110780             @DirectCmd  chip1 EMRS1 (OCD default)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00110400             @DirectCmd  chip1 EMRS1 (OCD exit)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x0FF02030             @ConControl auto refresh on
    str r1, [r0, #DMC_CONCONTROL]

    ldr r1, =0xFFFF00FF             @PwrdnConfig
    str r1, [r0, #DMC_PWRDNCONFIG]

    ldr r1, =0x00202400             @MemControl BL=4, 1 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
    str r1, [r0, #DMC_MEMCONTROL]

    /* DMC1 initialization */
    ldr r0, =APB_DMC_1_BASE

    ldr r1, =0x00101000             @Phycontrol0 DLL parameter setting
    str r1, [r0, #DMC_PHYCONTROL0]

    ldr r1, =0x00000086             @Phycontrol1 DLL parameter setting
    str r1, [r0, #DMC_PHYCONTROL1]

    ldr r1, =0x00101002             @PhyControl0 DLL on
    str r1, [r0, #DMC_PHYCONTROL0]

    ldr r1, =0x00101003             @PhyControl0 DLL start
    str r1, [r0, #DMC_PHYCONTROL0]
find_lock_val1:
    ldr r1, [r0, #DMC_PHYSTATUS] @Load Phystatus register value
    and r2, r1, #0x7
    cmp r2, #0x7 @Loop until DLL is locked
    bne find_lock_val1

    and r1, #0x3fc0
    mov r2, r1, LSL #18
    orr r2, r2, #0x100000
    orr r2, r2, #0x1000

    orr r1, r2, #0x3 @Force Value locking
    str r1, [r0, #DMC_PHYCONTROL0]

#if 0 /* Memory margin test 10.01.05 */
    orr r1, r2, #0x1 @DLL off
    str r1, [r0, #DMC_PHYCONTROL0]
#endif

    /* settinf fot DDR2 */
    ldr r0, =APB_DMC_1_BASE

    ldr r1, =0x0FFF2010             @auto refresh off
    str r1, [r0, #DMC_CONCONTROL]

    ldr r1, =DMC1_MEMCONTROL            @MemControl BL=4, 2 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
    str r1, [r0, #DMC_MEMCONTROL]

    ldr r1, =DMC1_MEMCONFIG_0           @MemConfig0 512MB config, 8 banks,Mapping Method[12:15]0:linear, 1:linterleaved, 2:Mixed
    str r1, [r0, #DMC_MEMCONFIG0]

    ldr r1, =DMC1_MEMCONFIG_1           @MemConfig1
    str r1, [r0, #DMC_MEMCONFIG1]

    ldr r1, =0xFF000000
    str r1, [r0, #DMC_PRECHCONFIG]

    ldr r1, =DMC1_TIMINGA_REF           @TimingAref 7.8us*133MHz=1038(0x40E), 100MHz=780(0x30C), 20MHz=156(0x9C), 10MHz=78(0x4
    str r1, [r0, #DMC_TIMINGAREF]

    ldr r1, =DMC1_TIMING_ROW            @TimingRow  for @200MHz
    str r1, [r0, #DMC_TIMINGROW]

    ldr r1, =DMC1_TIMING_DATA           @TimingData CL=3
    str r1, [r0, #DMC_TIMINGDATA]

    ldr r1, =DMC1_TIMING_PWR            @TimingPower
    str r1, [r0, #DMC_TIMINGPOWER]


    ldr r1, =0x07000000             @DirectCmd  chip0 Deselect
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01000000             @DirectCmd  chip0 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00020000             @DirectCmd  chip0 EMRS2
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00030000             @DirectCmd  chip0 EMRS3
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00010400             @DirectCmd  chip0 EMRS1 (MEM DLL on, DQS# disable)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00000542             @DirectCmd  chip0 MRS (MEM DLL reset) CL=4, BL=4
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01000000             @DirectCmd  chip0 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05000000             @DirectCmd  chip0 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05000000             @DirectCmd  chip0 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00000442             @DirectCmd  chip0 MRS (MEM DLL unreset)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00010780             @DirectCmd  chip0 EMRS1 (OCD default)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00010400             @DirectCmd  chip0 EMRS1 (OCD exit)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x07100000             @DirectCmd  chip1 Deselect
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01100000             @DirectCmd  chip1 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00120000             @DirectCmd  chip1 EMRS2
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00130000             @DirectCmd  chip1 EMRS3
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00110440             @DirectCmd  chip1 EMRS1 (MEM DLL on, DQS# disable)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00100542             @DirectCmd  chip1 MRS (MEM DLL reset) CL=4, BL=4
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01100000             @DirectCmd  chip1 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @DirectCmd  chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @DirectCmd  chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00100442             @DirectCmd  chip1 MRS (MEM DLL unreset)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00110780             @DirectCmd  chip1 EMRS1 (OCD default)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00110400             @DirectCmd  chip1 EMRS1 (OCD exit)
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x0FF02030             @ConControl auto refresh on
    str r1, [r0, #DMC_CONCONTROL]

    ldr r1, =0xFFFF00FF             @PwrdnConfig
    str r1, [r0, #DMC_PWRDNCONFIG]

    ldr r1, =DMC1_MEMCONTROL            @MemControl BL=4, 2 chip, DDR2 type, dynamic self refresh, force precharge, dynamic power down off
    str r1, [r0, #DMC_MEMCONTROL]

#else /* CONFIG_MCP_SINGLE */

    /* DMC0 initialization */
    ldr r0, =APB_DMC_0_BASE

    ldr r1, =0x00101000             @Phycontrol0 DLL parameter setting
    str r1, [r0, #DMC_PHYCONTROL0]

    ldr r1, =0x00000084             @Phycontrol1 DLL parameter setting
    str r1, [r0, #DMC_PHYCONTROL1]

    ldr r1, =0x00101002             @Phycontrol2 DLL parameter setting
    str r1, [r0, #DMC_PHYCONTROL0]

    ldr r1, =0x00101003             @Dll on
    str r1, [r0, #DMC_PHYCONTROL0]

find_lock_val:
    ldr r1, [r0, #DMC_PHYSTATUS] @Load Phystatus register value
    and     r2, r1, #0x7
    cmp r2, #0x7 @Loop until DLL is locked
    bne find_lock_val

    and r1, #0x3fc0
    mov r2, r1, LSL #18
    orr r2, r2, #0x100000
    orr r2, r2, #0x1000

    orr r1, r2, #0x3 @Force Value locking
    str r1, [r0, #DMC_PHYCONTROL0]
#if 1 /* DRAM margin test 10.01.06 */
    orr r1, r2, #0x1 @DLL off
    str r1, [r0, #DMC_PHYCONTROL0]
#endif
    ldr r1, =0x0fff1010             @auto refresh off
    str r1, [r0, #DMC_CONCONTROL]

    ldr r1, =0x00212100
    str r1, [r0, #DMC_MEMCONTROL]

    ldr r1, =DMC0_MEMCONFIG_0
    str r1, [r0, #DMC_MEMCONFIG0]

    ldr r1, =DMC0_MEMCONFIG_1
    str r1, [r0, #DMC_MEMCONFIG1]

    ldr r1, =0xff000000
    str r1, [r0, #DMC_PRECHCONFIG]

    ldr r1, =DMC0_TIMINGA_REF
    str r1, [r0, #DMC_TIMINGAREF]

    ldr r1, =DMC0_TIMING_ROW            @TimingRow  @133MHz
    str r1, [r0, #DMC_TIMINGROW]

    ldr r1, =DMC0_TIMING_DATA
    str r1, [r0, #DMC_TIMINGDATA]

    ldr r1, =DMC0_TIMING_PWR            @Timing Power
    str r1, [r0, #DMC_TIMINGPOWER]

    ldr r1, =0x07000000             @chip0 Deselect
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01000000             @chip0 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05000000             @chip0 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05000000             @chip0 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00000032             @chip0 MRS
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x07100000             @chip1 Deselect
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01100000             @chip1 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00100032             @chip1 MRS
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x0FFF20B0         @ConControl auto refresh on
    str r1, [r0, #DMC_CONCONTROL]

    ldr r1, =0xFFFF00FF             @PwrdnConfig
    str r1, [r0, #DMC_PWRDNCONFIG]

    ldr r1, =0x00212113             @MemControl
    str r1, [r0, #DMC_MEMCONTROL]

/* DMC1 initialization */
    ldr r0, =APB_DMC_1_BASE

    ldr r1, =0x00101000             @Phycontrol0 DLL parameter setting
    str r1, [r0, #DMC_PHYCONTROL0]

    ldr r1, =0x00000084             @Phycontrol1 DLL parameter setting
    str r1, [r0, #DMC_PHYCONTROL1]

    ldr r1, =0x00101002             @Phycontrol2 DLL parameter setting
    str r1, [r0, #DMC_PHYCONTROL0]

    ldr r1, =0x00101003             @Dll on
    str r1, [r0, #DMC_PHYCONTROL0]

find_lock_val1:
    ldr r1, [r0, #DMC_PHYSTATUS] @Load Phystatus register value
    and     r2, r1, #0x7
    cmp r2, #0x7 @Loop until DLL is locked
    bne find_lock_val1

    and r1, #0x3fc0
    mov r2, r1, LSL #18
    orr r2, r2, #0x100000
    orr r2, r2, #0x1000

    orr r1, r2, #0x3 @Force Value locking
    str r1, [r0, #DMC_PHYCONTROL0]

#if 1 /* Memory margin test 10.01.05 */
    orr r1, r2, #0x1 @DLL off
    str r1, [r0, #DMC_PHYCONTROL0]
#endif
    ldr r0, =APB_DMC_1_BASE

    ldr r1, =0x0FFF1010             @auto refresh off
    str r1, [r0, #DMC_CONCONTROL]

    ldr r1, =0x00212100
    str r1, [r0, #DMC_MEMCONTROL]

    ldr r1, =DMC1_MEMCONFIG_0
    str r1, [r0, #DMC_MEMCONFIG0]

    ldr r1, =DMC1_MEMCONFIG_1
    str r1, [r0, #DMC_MEMCONFIG1]

    ldr r1, =0xff000000
    str r1, [r0, #DMC_PRECHCONFIG]

    ldr r1, =DMC1_TIMINGA_REF
    str r1, [r0, #DMC_TIMINGAREF]

    ldr r1, =DMC1_TIMING_ROW            @TimingRow  @133MHz
    str r1, [r0, #DMC_TIMINGROW]

    ldr r1, =DMC1_TIMING_DATA
    str r1, [r0, #DMC_TIMINGDATA]

    ldr r1, =DMC1_TIMING_PWR            @Timing Power
    str r1, [r0, #DMC_TIMINGPOWER]

    ldr r1, =0x07000000             @chip0 Deselect
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01000000             @chip0 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05000000             @chip0 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05000000             @chip0 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00000032             @chip0 MRS
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00020020             @chip0 EMRS
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x07100000             @chip1 Deselect
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x01100000             @chip1 PALL
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x05100000             @chip1 REFA
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00100032             @chip1 MRS
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x00120020             @chip0 EMRS
    str r1, [r0, #DMC_DIRECTCMD]

    ldr r1, =0x0FFF10B0             @ConControl auto refresh on
    str r1, [r0, #DMC_CONCONTROL]

    ldr r1, =0xFFFF00FF             @PwrdnConfig
    str r1, [r0, #DMC_PWRDNCONFIG]

    ldr r1, =0x00212113             @MemControl
    str r1, [r0, #DMC_MEMCONTROL]

#endif /* CONFIG_MCP_AC / CONFIG_MCP_H / CONFIG_MCP_B / CONFIG_MCP_D */

    mov pc, lr


/* Below code is for ARM926EJS and ARM1026EJS */
    .globl cleanDCache
cleanDCache:
    mrc p15, 0, pc, c7, c10, 3  /* test/clean D-Cache */
    bne cleanDCache
    mov pc, lr

    .globl cleanFlushDCache
cleanFlushDCache:
    mrc p15, 0, pc, c7, c14, 3  /* test/cleanflush D-Cache */
    bne cleanFlushDCache
    mov pc, lr

    .globl cleanFlushCache
cleanFlushCache:
    mrc p15, 0, pc, c7, c14, 3  /* test/cleanflush D-Cache */
    bne cleanFlushCache
    mcr p15, 0, r0, c7, c5, 0   /* flush I-Cache */
    mov pc, lr

    .ltorg


/* * v7_flush_dcache_all() * * Flush the whole D-cache. * * Corrupted registers: r0-r5, r7, r9-r11 * * - mm - mm_struct describing address space */
       .align 5
.global v7_flush_dcache_all
v7_flush_dcache_all:

        ldr     r0, =0xffffffff
        mrc     p15, 1, r0, c0, c0, 1           @ Read CLIDR
        ands    r3, r0, #0x7000000
        mov     r3, r3, LSR #23 @ Cache level value (naturally aligned)
        beq     Finished
        mov     r10, #0
Loop1:
        add     r2, r10, r10, LSR #1 @ Work out 3xcachelevel
        mov     r1, r0, LSR r2                  @ bottom 3 bits are the Ctype for this level
        and     r1, r1, #7 @ get those 3 bits alone
        cmp     r1, #2
        blt     Skip                            @ no cache or only instruction cache at this level
        mcr     p15, 2, r10, c0, c0, 0          @ write the Cache Size selection register
        mov     r1, #0
        mcr     p15, 0, r1, c7, c5, 4           @ PrefetchFlush to sync the change to the CacheSizeID reg
        mrc     p15, 1, r1, c0, c0, 0           @ reads current Cache Size ID register
        and     r2, r1, #0x7 @ extract the line length field
        add     r2, r2, #4 @ add 4 for the line length offset (log2 16 bytes)
        ldr     r4, =0x3FF
        ands    r4, r4, r1, LSR #3 @ R4 is the max number on the way size (right aligned)
        clz     r5, r4                          @ R5 is the bit position of the way size increment
        ldr     r7, =0x00007FFF
        ands    r7, r7, r1, LSR #13 @ R7 is the max number of the index size (right aligned)
Loop2:
        mov     r9, r4                          @ R9 working copy of the max way size (right aligned)
Loop3:
        orr     r11, r10, r9, LSL r5            @ factor in the way number and cache number into R11
        orr     r11, r11, r7, LSL r2            @ factor in the index number
        mcr     p15, 0, r11, c7, c6, 2          @ invalidate by set/way
        subs    r9, r9, #1 @ decrement the way number
        bge     Loop3
        subs    r7, r7, #1 @ decrement the index
        bge     Loop2
Skip:
        add     r10, r10, #2 @ increment the cache number
        cmp     r3, r10
        bgt     Loop1
Finished:
        mov     pc, lr

    .align  5
.global disable_l2cache
disable_l2cache:
        mrc     p15, 0, r0, c1, c0, 1
        bic     r0, r0, #(1<<1)
        mcr     p15, 0, r0, c1, c0, 1
        mov     pc, lr


       .align  5
.global enable_l2cache
enable_l2cache:
        mrc     p15, 0, r0, c1, c0, 1
        orr     r0, r0, #(1<<1)
        mcr     p15, 0, r0, c1, c0, 1
        mov     pc, lr

       .align  5
.global set_l2cache_auxctrl
set_l2cache_auxctrl:
        mov     r0, #0x0
        mcr     p15, 1, r0, c9, c0, 2
        mov     pc, lr

       .align  5
.global set_l2cache_auxctrl_cycle
set_l2cache_auxctrl_cycle:
        mrc     p15, 1, r0, c9, c0, 2
        bic     r0, r0, #(0x1<<29)
        bic     r0, r0, #(0x1<<21)
        bic     r0, r0, #(0x7<<6)
        bic     r0, r0, #(0x7<<0)
        mcr     p15, 1, r0, c9, c0, 2
        mov     pc,lr

        .align 5
CoInvalidateDCacheIndex:
        ;/* r0 = index */
        mcr     p15, 0, r0, c7, c6, 2
        mov     pc,lr

如果你觉得写得还行,转载时请保留作者信息。作者:捷宇 邮箱:jayyuz@163.com 博客:http://blog.csdn.net/jayyuz

推荐:Tiny210(S5PV210) U-BOOT(五)----Nand Flash源码分析

1.u-boot参考源码  Nand Flash的初始化代码在board/samsung/tiny210/lowlevel_init.S  2.初始化Nand Flash 在u-boot中,Nand的低级初始化在lowlevel_init.S中的n

接上一篇,这一篇写得是内存初始化。本人对ddr初始化,不是特别懂。只是勉强翻译注释。如有错误,希望高手能不吝赐教。废话不多说,贴上这该死的代码。 /* * armboot - Memory Initialize Code

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